Composition for preserving wood.



' quick impregnation.

" union FIR ITZ PETER-S, 0F BERLIN, GERMANY.

ooMPosIrIo iv roia. ransnnvmo wooro.

No Drawing.

tion of the same.

One has already proposed to preservewood by impregnation with dinitrophenols or their salts. It is, however, impossible to use the free dinitrophenols, alone or with additions of other preserving means in iron vessels, becausethe free dinitrophenols are chemically changed by contact with iron, so

that the fungicide and preserving power is diminished. This disadvantage enters especially, if the impregnating liquid containing free dinitrophenols is warmed, which is preferable for causing a complete and The salts of dinitrophenols attack especially iron, if they are used with common ammonium sulfate, magnesium sulfate, sodium fluorid, or sodium sulfate as is usual for increasing the preserving power, especially against merculius fungi and for diminishing the inflammability of the impregnated wood. With reference to the quoted behavior of the dinitrophenols and their salts one could only use them by coating wood or by mere immersion. but not by pneumatic impregnation.

The purpose of the present invention is to procure a preserving agent which can be used in iron vessels without attacking them and which is suitable for pneumatic impregnation.

The impregnating composition consists of dinitrophenolsor their salts and soluble inorganic salts of chromic acid or of boric acid, of phosphoric acid, of bromic acid or of iodic acid. Suitable salts are potassium chromate, potassium bichromate, sodium chromate, sodium bichromate, ammonium chromate, ammonium bichromate, dipotassiumphosphate, diso'diumphosphata. diammoniumphosphate, potassium bromate, ammonium bromate, sodium 'bromate, sodium iodate, ammonium iodate, potassium iodate. One'may, use the said salts mixed with each Specification of Letters Patent.

Patented May 7,1918.

Application filed November 13, 1914'. Serial No. 871,902.

other. One may add to the composition fireproofin'g salts, as for instance ammonium sulfate, magnesium sulfate, sodium fiuorid, iolgium sulfate, alkali fluosilicate or such A suitable composition consists of- 90-98 parts by weight of dinitrophenols,

10-2 parts by weight of potassium bichromate, or sodium bichromate, or potassium chromate or sodium chromate alone or mixed with each other or one or several of the other quoted salts,

Another suitable composition consists of-- 80-90 parts by weight of dini-trophenols,

1.0-8parts by weight of a soluble fireproofing salt, as for instance magnesium sulfate,

10-2 parts by weight of potassium bichromate or sodium bichromate or potassium chromate or sodium chromate alone or mixed with each other or one or several of the other quoted salts. For carrying out the impregnation one dissolves the mixture in water and introduces theesolution into the wood by pressure or by exhausting the wood and introducing thev liquid by atmospheric or higher pressure. The liquid may be used in warm state for instance at a temperature of 60-80 degrees centigrade. The impregnation may be carried out in iron vessels.

I claim:

1. A composition of matter for preserving wood containing C H,(NO OR, in which R represents either hydrogen or a monovalent metal.

2. A composition of matter for preserving wood, containing dinitrophenol and a soluble salt of an inorganic acid incapable of attacking iron.

3. A composition of matter for preserving wood, containing dinitrophenol, a soluble salt of an inorganic acid incapable of attacking iron, and a fireproofing soluble salt.

4. A composition of matter for preserving wood, containing dinitrophenol and a soluble inorganic salt of chromic acid.

In testimony whereof, I have signed my name to this specification in the presence of two subscribing witnesses.

Witnesses WOLDEMAR HAUPT,

HENRY HASPER.

FRITZ PETERS. 

